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Share Capital - Schedule of Conditional Capital Reserved for Future Issuance (Parenthetical) (Detail)	1 Months Ended
	May 31, 2017 shares
Equity [Abstract]
Number of options approved	2,012,684

X

- Definition

Number of options approved to be granted.

+ References

No definition available.

+ Details

Name:	crsp_NumberOfOptionsApprovedToBeGranted
Namespace Prefix:	crsp_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_EquityAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration